Not true at all. For the vast majority of Americans, electricity is much cleaner than gas powered cars. In CA, most electricity is natural gas and alot of it is wind and water powered.
Even in areas that use the dirtiest fuels (coal, oil) for electricity, remember that you could put much better pollution prevention (scrubbers, etc.) on a energy plant's exhaust pipe than you can on each individual car's tailpipe.
EVs are WAYYYYYY cleaner than gas powered cars. That is clear.
Keep on drinking the Kool aid. I remember parts of my engineering classes quite well. Max theoretical output of a carnot engine is around 40 percent. No matter how you heat the water. And that MAX THEORETICAL output. Reality is your getting about 30 percent.